nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq98t8kgwqas59rvmnghzcdn6krzhxhpkyt2mt53e4g9sdnj74sszsv4x759 (nprofile…x759) I think I can guess which IRC service this was written for...
(Regarding ICU C2: as an IRC server doesn't store any messages I'd be tempted to say that it's "not necessary" rather than "not possible". I'd argue it's akin to a social media service not being obliged to take down content you've saved to your computer...)